A heinous Brooklyn dad was arrested Sunday morning and charged with abusing his 3-year-old son, forcing the tot to kneel on Lego pieces until he bled, striking him on the back with a wire, burning his feet and shooting him with a pellet gun, police sources said.

Leonardo Decouite, 22, was arrested about 4 a.m. and charged with four counts of felony assault for abusing his toddler, police said.

The baby’s mom, Kiana Mohansingh, 20, was charged with assault, cops said. She failed to get him treatment for his injuries, which included second-degree burns on his feet, the sources said.

Decouite struck the child on his back with a cable wire, burned his right hand and caused second-degree burns on both his feet, cops said. He also forced him to kneel on the Lego toys, cutting his knees, and shot him in the right foot with a pellet gun, the sources said.

He was charged with four counts of felony assault.

Decouite was arrested in November 2015 on a charge of criminal possession of marijuana. He has more than a dozen sealed arrests.